Modern instruments and methods of calculation : a handbook of the Napier Tercentenary Exhibition (1914)
Horsburg, E. M. (Ellice Martin), Napier Tercentenary Exhibition (1914 : Edinburgh, Scotalnd) · London : G. Bell · leaf 300
Fig. i.—Precision Pantograph. for any shrinkage of the paper of old drawings, so often met with. The (pantograph consists of a heavy crane-shaped iron standard consisting ofa bow H, a weight B, and a sole plate K. From the top of the standardare suspended, by a couple of thin wires, four bars, 1,… … Fig. 2.—Precision Pantograph with Projecting Standard. The axis of rotation pk is set vertical by the levelling screws S and thelevels L. The four bars form a parallelogram which, at one corner, moves rounda ball-joint, as illustrated in fig. 1. Two of the pivot-joints are mountedon sleeves that…
